var TypeHelpers = new function(){
    var me = this;

    me.hasSmoothing = function(){
    // IE has screen.fontSmoothingEnabled - sweet!      
    if (typeof(screen.fontSmoothingEnabled) != "undefined") {
      return screen.fontSmoothingEnabled;  
    } else {
        try {
      // Create a 35x35 Canvas block.
        var canvasNode = document.createElement("canvas");
        canvasNode.width = "35";
        canvasNode.height = "35"
        
        // We must put this node into the body, otherwise 
        // Safari Windows does not report correctly.
        canvasNode.style.display = "none";
        document.body.appendChild(canvasNode);
        var ctx = canvasNode.getContext("2d");
        
        // draw a black letter "O", 32px Arial.
        ctx.textBaseline = "top";
        ctx.font = "32px Arial";
        ctx.fillStyle = "black";
        ctx.strokeStyle = "black";
        
        ctx.fillText("O", 0, 0);
        
        // start at (8,1) and search the canvas from left to right,
        // top to bottom to see if we can find a non-black pixel.  If
        // so we return true.
        for (var j = 8; j <= 32; j++) {
          for (var i = 1; i <= 32; i++) {
            var imageData = ctx.getImageData(i, j, 1, 1).data
            var alpha = imageData[3];
                                    
            if (alpha != 255 && alpha != 0 && alpha > 180) {
              return true; // font-smoothing must be on.
              }
            }

          }
         
          // didn't find any non-black pixels - return false.
          return false;
        } 
        catch (ex) {
          // Something went wrong (for example, Opera cannot use the
          // canvas fillText() method.  Return null (unknown).
          return null;
        }
      }
    }  
    $(document).ready(function() {
        var result = me.hasSmoothing();
        if (result == true) {
          $('html').addClass('');// default
        } else if (result == false) {
          $('html').addClass('without-cleartype');
        } else { // result == null
          $('html').addClass('unknown'); 
        }
  });
}